CONSTRUCTION AND ASSIGNMENT OF ORTHOGONAL SEQUENCES AND ZERO CORRELATION ZONE SEQUENCES FOR APPLICATIONS IN CDMA SYSTEMS

摘要

Orthogonal sequences can be assigned to a regular tessellation of hexagonal cells, typical for synchronised code-division multiple-access (S-CDMA) systems. In this paper, we first construct a new class of orthogonal sequences with increasing the number of users per cell to be 2(m-2) for even number m >= 4 (where 2(m) is the length of the sequences). In addition, based on the above construction we construct a family of orthogonal sequences with zero correlation zone property which can be applied to the quasi-synchronous CDMA (QS-CMDA) spread spectrum systems.